Machine-table-spindle bearing.



E. P. BULLARD, JR. MACHINE` TABLE SPINDLE BEARING.

. APPLICATION FILED MAR.12. 1910. 1,047; 62. u Patented. Dec. 1'?, 1912.

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E. P. BULLARD, JR'. MACHINE TABLE SBINDLB .BEAR-ING.

APPLIQIATIIDN' FILED MAR. 12, 1910. 1,047, 62, Patented Dec. 17,1912.

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' -accompanying drawing and of which UNITED STATES PATENT onirica EDWARD P. BULLARD, iin., or :snrnenronig CONNECTICUT, AssIeNon To THE BULLA'RD MACHINE TOOL CO., OF BRIDGEPORT,

CONNECTICUT, A. CORPORATION 'OF ON- MACHINEfTABLE-SPINDLE BEARING.

To all 'whom it 'may concern: v

Be itl known that 1 EDwAndP. BULLARD, Jr., a citizen of the United Sta es, and resident of Bridgeport, in the couritycf-Fairfield and State of Connecticut, have invented certain new and useful Improvements in Machine-Table-Spindle Bearings, of which the following is a specification'.

This invention refers to machine Atools and relates particularly to an improved form of bearing and spindle as employed in vert-ical turret lathes and other forms of machines, and it is t-he object to improve upon "the construction for oiling the said bearing;z whereby the saine may be operated in a circulating body ofy oil, thereby insuring a proper'distribution, and oilng of all operative part-s.

Similar-. 'characters of. reference will be.

found to designate like or corresponding parts throughout the several figures of the Figure 1, shows a central vertical longitudinal section through a machinel tool spindle constructed in accordance with my invention. Fig. 2, shows a detached side elevation of the rotatable table and spindle shown in Fig. 1, and Figi 3, shows a vertical section of the table spindle bearing shown, in Fig. 1, taken at a right angle from that pf F ig. l.

Referring to the drawings, numerals 2 and 3 represent respectively the outer and inner annular walls of the base frame 1 which support t-he lat-he table. f

4 represents a rotatable table having a rack 5 formed on the inner face of the depanding annular fiange 6. With this rack a pinion T'meshes, which in turn is .driven through suitable gears 8 from a horizontal shaft 9 connected to the motor 10.

The annular wall 3 of the base frame forms a central welladapted to receive the hollow rotatable spindle 11 of the table 4. This spindle has radial holes 12 and 13 and peripheral right hand spiral grooves 14 and 15, for a purpose hereinafter described.

. Within the hollow spindle 11 is a tubular pipe 16 externally screw threaded at its lower end at 17 upon which the plate 18 screws and is secured thereto and to the base frame by bolts 19. .This`plate18 has an opening 32 communicating with pocket 31 normally closed by plug 33 and packing 34.

4 Specification of Letters Patent.` Application led March 12, 1910. Serial No. 548;.809.

Patented'Decl 1 7, 1912.

slightly'less than the pipe 16,'into'l-th'e upper end of which it extends a 'shortdistance ing surface 23, upon the underside of the table. These -inclined bearing surfaces are below the surface line of the` oil withinthe pocket 24 formed by; wall 25 thus insuring.

the 'lubrication of surfaces.

26 represents a lfilling cupI or reservoir connected through pipe 2.7 .with an oil pocket v28, located in the upper portionof the frame and through which theoil is fed their entire contacting to `the bearings 23 for lubricating vthe same.v

The initial filling of the bearings withfoil is obviouslythrough the before mentioned' cup and pipe, and radial oil chambers 2'Sbfornicd in the bearingsurface 22. An inclined passageway 3Q extending through the wall 3 further serves to direct the oil from the chamber 29 at the top to the before mentioned pockets 20 andl- 31. When filled these pockets overflow into thechamber 21 which is also quickly filled to the point indicated in Fig. 1, that being the level ofthe oil in reservoirs and annular pocket 24.

vAfter the bearings are filled as above and the table started to rotate, the oil throughout the bearing is caused to circulate inthe following manner and by r'eason of the spiral grooves 14 and 15 in t-he spindle which is driven inthe direction of the arrow, see Fig.

2. These grooves obviouslyserve to draw the oil through the holes 12 from theinnercliambe1\ 21 and. force it' down around the outer surface of the spindle. The oil is thus worked into the pockets 20 and 31 and through the holes 13 and openings 36 back into the inner chamber 21 when it rises to again be passed through the holes and down upon the outside and back upon the'inside.

It will readily be seen from the foregoing that the entire bearings ofthe table are submerged and at acontinuous circulation of the oil inwhich. the spindle operates is effected, by the action of said spindle and the a tendency to draw the oil from all the pock- 1n a manner to thoroughly lubricate all the operative parts.

What I claim as my invention is l j 1.' In a self lubricating table and spindle bearing for machine tools, the combination of a base frame having a'central opening therethrough, a cap attached over the lower end of the opening, a centrally disposed pipe attached to the cap and projected through the lsaid central opening, a spindlemounted 1n said opening and surrounding the pipe and having a cut away portion on both its inner and outer sides and holes therethrough to form communicating oil pockets between sari/d Spindle and pipe, and va sleeve attached td. the ltable and extending down into the said pipe.

2L A self lubricating table and spindle bearing for machine tools, comprising' a base frame having an oil pocket therein and a downwardly inclined oil passage extending y through the wall Ithereof and also having an inclined bearing on said base with a radial slot therethrough communicating with said oil pocket and said inclined passage, and a removable hollovsT spindle that extends down into the base frame and having an inclined' portion to rotate upon the bearing of the frame and having oil passages therethrough,

a tubular member for inclosing the lower end of the spindle and'extending up therein to form an annular oil pocket against the in` side of the spindle, and a sleeve extending from the table into the said tube.

:spiral grooves 14 andk 15 thereofwhich have i 3. In a self lubricating table and spindle bearing for machine tools, the' combination with a base frame provided with an inclined bearing and a central spindle hole,

, a .cap attached over the lower end of the hole, ahollow spindle within said hole and having an inclined bearing toiit that of the fraine and provided with peripheral siral grooves that are inclosed by the side wal s of the hole and having radial openings passing through the said spindle, a tubular member secured to the said c'ap and extended up within said spindle and separated therefrom to form an oil chamber between it and the inside of the spindle.

4. A self lubricating table and spindle for machine tools, comprising a base frame having a spindle socket therein, a hollow spindle, fitting in said socket having right and left hand peripheral spiral grooves respectively adjacent the upper and lower ends thereof and inclosed by the walls of the socket to cause the lubricant to circulate, a pipe Within said spindle spaced therefrom to form an oil chamber, the adjacent contacting surfaces of said spindle and base frame being recessed to form an oil pocket and said spindle having radial openings connecting said oil pocket and chamber, and a plate adapted to secure said pipe to the base frame. f 

